1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.csv;
19
20 /**
21 * Determines how duplicate header fields should be handled
22 * if {@link CSVFormat.Builder#setHeader(Class)} is not null.
23 *
24 * @since 1.10.0
25 */
26 public enum DuplicateHeaderMode {
27
28 /**
29 * Allows all duplicate headers.
30 */
31 ALLOW_ALL,
32
33 /**
34 * Allows duplicate headers only if they're empty, blank, or null strings.
35 */
36 ALLOW_EMPTY,
37
38 /**
39 * Disallows duplicate headers entirely.
40 */
41 DISALLOW
42 }